JP3398046B2 - Slot rod for optical fiber cable - Google Patents
Slot rod for optical fiber cableInfo
- Publication number
- JP3398046B2 JP3398046B2 JP11489098A JP11489098A JP3398046B2 JP 3398046 B2 JP3398046 B2 JP 3398046B2 JP 11489098 A JP11489098 A JP 11489098A JP 11489098 A JP11489098 A JP 11489098A JP 3398046 B2 JP3398046 B2 JP 3398046B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- slot rod
- layer
- groove
- main body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4407—Optical cables with internal fluted support member
- G02B6/4408—Groove structures in support members to decrease or harmonise transmission losses in ribbon cables
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は光通信用ケーブルを
構成するスロットロッドに関するものである。
【０００２】
【従来技術】光ファイバケーブルには工場における製造
時、巻き取り時、布設時あるいは布設後に外部からの圧
力等が加わる。この圧力から光ファイバケーブルを保護
し、外圧等による損傷を防止するために、長手方向に螺
旋状または波状の光ファイバ収納溝を設けたスロットロ
ッドに光ファイバを収納し、ケーブル化している。な
お、この明細書で「光ファイバ」とは、光ファイバ単
線、光ファイバ単線を複数本束ねた光ファイバ集合体、
光ファイバ単線を平行に並べて共通の被覆を被せた光フ
ァイバテープ心線等を総称する用語として使用する。図
４（イ）に示すように従来、この種スロットロッド４０
は中心にテンションメンバー４１と、該テンションメン
バー４１の外周に設けた熱可塑性樹脂の充実体からなる
光ファイバ収納部本体４２とからなっている。光ファイ
バ収納部本体４２は熱可塑性樹脂等をＦＲＰまたは鋼線
等のテンションメンバー４１の外周に複数本のリブ部４
３が放射線状に伸びるように押出形成し、該リブ部４３
とリブ部４３との間で光ファイバ収納溝４４を形成して
いる。
【０００３】近年、光ファイバによる通信網の発展によ
り光ファイバケーブルを構成する光ファイバの本数増加
が要望され、それに伴って光ファイバを多数本収納でき
るスロットロッドの出現が望まれている。この要望に対
して、スロットロッドの太さを太くして対応することも
考えられるが、スロットロッドを太くすると可撓性が低
下し、ケーブルが曲がらなくなる等の問題が発生する。
このため、スロットロッドの可撓性を低下させずにスロ
ットロッドの太さを太くする対策として、スロットロッ
ドの光ファイバ収納部本体を発泡プラスチックで構成す
る試みがなされている。
【０００４】
【発明が解決しようとする課題】スロットロッド４０の
光ファイバ収納部本体４２を発泡プラスチックで構成し
た一つの例は、光ファイバ収納部本体４２全体を発泡プ
ラスチックで構成したものであり、このような構成にす
ることによりスロットロッドの可撓性は著しく向上す
る。しかしながら、この構造のスロットロッドでは、放
射状に伸びるリブ部４３で形成される光ファイバ収納溝
４４の表面も発泡層であるために、図４（ロ）に示すよ
うに該光ファイバ収納溝４４に収納する光ファイバ４９
が収納溝４４と接する面４８は発泡面であるために多数
の凹凸が存在する（平滑面でない）。従って、この凹凸
のある面４８に光ファイバ４９が収納されると光ファイ
バ４９がこの凹凸面４８により曲げられ、光損失が増大
する欠点がある。
【０００５】この欠点を解消するための改良案として図
５に示すように、テンションメンバー５１の外周を発泡
プラスチック層５５とし、該発泡プラスチック層５５の
外周５６と光ファイバ収納溝５４を構成するリブ部５３
とをプラスチック充実体で構成したタイプのスロットロ
ッド５０が提案されている（特開平８−２３４０６６
号）。このように、光ファイバ収納溝５４を構成するリ
ブ部５３は充実体で形成されているので、即ち溝５４の
表面が平滑面となっているので、光損失増大の問題は解
消されるが、スロットロッド５０の最外層５６が充実体
で構成されているために可撓性が十分でなく、光ファイ
バの本数の増加によっては可撓性が不足する恐れがあ
る。本発明は以上の問題点を解決するためになされたも
ので、スロットロッドを太くしても可撓性が損なわれ
ず、光ファイバの光損失を増加させず、生産性に優れた
スロットロッドを提供することにある。
【０００６】
【課題を解決するための手段】本発明は、テンションメ
ンバーと該テンションメンバーの外周に設けた光ファイ
バ収納部本体とからなり、該光ファイバ収納部本体は放
射線状に伸びるリブ部を有し、該リブ部とリブ部との間
で構成される光ファイバ収納溝に光ファイバを収納する
スロットロッドにおいて、前記光ファイバ収納部本体は
発泡体で構成され、該発泡体で構成された光ファイバ収
納溝の少なくとも光ファイバと接触する表面が平滑な充
実体層で覆われていることを特徴とする光ファイバケー
ブル用スロットロッドである。本発明は光ファイバ収納
溝における光ファイバ心線との接触面を平滑面としたこ
とにより、該平滑な光ファイバ収納溝に光ファイバ心線
を収納しても光ファイバが収納溝の壁面によって曲げら
れることなく、従って、光損失が増大することはない。
さらに、本発明のスロットロッドは、光ファイバ収納溝
を発泡体層で構成したことにより可撓性を十分に確保で
き、光ファイバの本数の増加にも十分対応しうる可撓性
を有するものである。
【０００７】
【発明の実施の形態】図１（イ）は本発明の一実施形態
を示すスロットロッド１０で、該スロットロッド１０は
テンションメンバー１１と光ファイバ収納部本体１２と
で構成されている。光ファイバ収納部本体１２は、テン
ションメンバー１１の外周に設けた熱可塑性プラスチッ
ク充実体層からなる内層１５と、該充実体層からなる内
層１５の外周に設けた熱可塑性プラスチック発泡体から
なる外層１６からなり、外層１６は放射状に伸びるリブ
部１３と、該リブ部１３、リブ部１３との間で形成され
る光ファイバ収納溝１４とで構成されている。光ファイ
バ収納溝１４の表面１８は図１（ロ）に示すように熱処
理により、あるいは樹脂等を塗布することにより、また
はその他の方法により平滑面に仕上げられている。光フ
ァイバ収納溝１４の表面１８を平滑面に仕上げる部分は
溝１４の表面１８全てでもよく、あるいは、光ファイバ
１９と接触する表面のみでもよく、溝１４に収納される
光ファイバ１９に曲げ応力が加わらないように、即ち、
光ファイバ１９の光損失増加を防止できればいずれでも
よい。本発明スロットロッドは上述したように充実体層
からなる内層１５と発泡体層からなる外層１６とで構成
されている。従って外径の小さい内層１５を、機械的強
度では十分であるが可撓性の悪い充実体層とし、機械的
強度は弱いが可撓性に優れた発泡体層を外側としたこと
により、充実体層からなる内層１５の厚さは機械的強度
を満足するだけの厚さで十分であり、光ファイバ収納溝
１４を含む外層１６を光ファイバ心線数に合わせて設計
することが可能となる。以上は、光ファイバ収納部本体
１２の構成を充実体層からなる内層１５と発泡体層から
なる外層１６との組合せで説明したが、光ファイバケー
ブルの仕様（特に機械的強度）によっては該光ファイバ
収納部本体１２を全て発泡体層のみで構成することも可
能である。
【０００８】以下に本発明の実施例を説明する。外径
１．４ｍｍのＦＲＰからなるテンションメンバー１１の
外周に表１に示す厚さの光ファイバ収納部本体１２を設
けた。実施例１、２、比較例２の外層１６は発泡率４０
％のポリエチレン発泡体で、実施例１、比較例１の内層
はポリエチレン充実体で成形した。また、実施例１、２
の溝の表面には厚さ４００μｍの厚さにシリコン樹脂を
塗布硬化させて平滑面とした。このようなスロットロッ
ドの可撓性を測定した。測定はサンプル長５００ｍｍを
水平に片持ち支持し、固定端と反対側の端に荷重を加え
て変化量を測り、結果を図２に示した。次にこれらのス
ロットロッドに光ファイバ１９を５本挿入して光ファイ
バケーブルを作製し、光ファイバの光損失を測定した。
その結果を図３に示す。
【表１】
【０００９】図２のグラフから実施例２、比較例２は可
撓性に優れ、実施例１は実施例２に比べてやや可撓性に
劣るが比較例１に比べると可撓性はかなり優っている。
図３のグラフから分かるように実施例１、２、比較例１
の光損失は殆ど増加しない。しかしながら、比較例２の
光損失は０．１５ｄＢ／ｋｍと大きく増加している。こ
のように、本発明のスロットロッドは可撓性に優れ、光
損失を生じさせない優れたものである。上記実施例で
は、外層の発泡率を４０％としたが、発泡率は機械的強
度、可撓性等を考慮して１０〜７０％が適当であり、気
泡径は１０〜４００μｍであることが好ましい。また、
光ファイバ心線と接する溝を平滑に仕上げるには、ＵＶ
樹脂等の紫外線硬化樹脂やシリコン樹脂等の熱硬化性樹
脂により厚さ５０〜４００μｍの充実層にして平滑度を
あげるとことが好ましい。更に、本発明スロットロッド
を、光ファイバと接する溝表面に樹脂等を塗布して平滑
面とするため、発泡体押出による外層の成形加工に際
し、溝の寸法精度を問題としないで済むため、押出成形
速度を大幅にアップすることができ、生産性にも優れて
いる。
【００１０】
【発明の効果】以上詳述したように、本発明によれば、
可撓性に優れ、光損失を生じないスロットロッドを提供
できるため、光ファイバの本数増加にも十分に対応で
き、ますます発展する光ファイバによる通信網の構築に
貢献できる光ファイバケーブルを提供することができ
る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slot rod constituting an optical communication cable. [0002] External pressure or the like is applied to an optical fiber cable during manufacturing, winding, laying or after laying in a factory. In order to protect the optical fiber cable from this pressure and prevent damage due to external pressure or the like, the optical fiber is housed in a slot rod provided with a spiral or wavy optical fiber housing groove in the longitudinal direction, and is made into a cable. In this specification, "optical fiber" means an optical fiber single wire, an optical fiber aggregate obtained by bundling a plurality of optical fiber single wires,
An optical fiber ribbon or the like in which single optical fibers are arranged in parallel and covered with a common coating is used as a general term. Conventionally, as shown in FIG.
Is composed of a tension member 41 at the center and an optical fiber housing body 42 made of a solid body of thermoplastic resin provided on the outer periphery of the tension member 41. The optical fiber accommodating section main body 42 is made of a thermoplastic resin or the like formed on a plurality of ribs 4 on the outer periphery of a tension member 41 such as FRP or steel wire.
3 is extruded so as to extend radially, and the rib portion 43 is formed.
An optical fiber housing groove 44 is formed between the rib 43 and the rib 43. In recent years, with the development of a communication network using optical fibers, the number of optical fibers constituting an optical fiber cable has been increased, and accordingly, the appearance of a slot rod capable of accommodating a large number of optical fibers has been desired. To cope with this demand, it is conceivable to increase the thickness of the slot rod. However, if the slot rod is made thicker, there is a problem that the flexibility is reduced and the cable is not bent.
Therefore, as a measure to increase the thickness of the slot rod without reducing the flexibility of the slot rod, an attempt has been made to configure the optical fiber housing body of the slot rod with foamed plastic. One example in which the optical fiber housing portion main body 42 of the slot rod 40 is made of foamed plastic is one in which the entire optical fiber housing portion body 42 is made of foamed plastic. With this configuration, the flexibility of the slot rod is significantly improved. However, in the slot rod having this structure, since the surface of the optical fiber storage groove 44 formed by the radially extending ribs 43 is also a foamed layer, as shown in FIG. Optical fiber 49 to be stored
Since the surface 48 contacting the storage groove 44 is a foamed surface, there are many irregularities (not a smooth surface). Therefore, when the optical fiber 49 is accommodated in the uneven surface 48, the optical fiber 49 is bent by the uneven surface 48, and there is a disadvantage that light loss increases. [0005] As an improvement to solve this drawback, as shown in Fig. 5, the outer periphery of the tension member 51 is a foamed plastic layer 55, and the outer periphery 56 of the foamed plastic layer 55 and the ribs forming the optical fiber accommodating groove 54 are provided. Part 53
And a slot rod 50 of a type constituted by a solid plastic body (Japanese Patent Laid-Open No. Hei 8-234066).
issue). As described above, since the rib portion 53 constituting the optical fiber housing groove 54 is formed of a solid body, that is, since the surface of the groove 54 is a smooth surface, the problem of an increase in light loss is solved. Since the outermost layer 56 of the slot rod 50 is formed of a solid body, the flexibility is not sufficient, and the flexibility may be insufficient depending on the increase in the number of optical fibers. The present invention has been made in order to solve the above problems, and provides a slot rod which is excellent in productivity without deteriorating the flexibility even if the slot rod is made thick, does not increase the optical loss of the optical fiber. Is to do. SUMMARY OF THE INVENTION The present invention comprises a tension member and an optical fiber housing main body provided on the outer periphery of the tension member. The optical fiber housing main body has a radially extending rib. A slot rod for storing an optical fiber in an optical fiber storage groove formed between the rib portion and the rib portion, wherein the optical fiber storage portion main body is formed of a foam, and is formed of the foam. Optical fiber collection
A slot rod for an optical fiber cable, characterized in that at least a surface of the groove that contacts the optical fiber is covered with a smooth solid body layer. According to the present invention, the contact surface of the optical fiber storage groove with the optical fiber core wire is made smooth so that the optical fiber is bent by the wall surface of the storage groove even if the optical fiber core wire is stored in the smooth optical fiber storage groove. And thus no increase in light loss.
Furthermore, the slot rod of the present invention has sufficient flexibility by forming the optical fiber housing groove with a foam layer, and has sufficient flexibility to cope with an increase in the number of optical fibers. is there. FIG. 1A shows a slot rod 10 according to an embodiment of the present invention. The slot rod 10 is composed of a tension member 11 and an optical fiber housing main body 12. . The optical fiber housing main body 12 includes an inner layer 15 formed of a thermoplastic solid layer provided on the outer periphery of the tension member 11 and an outer layer 16 formed of a thermoplastic plastic foam provided on the outer periphery of the inner layer 15 formed of the solid layer. The outer layer 16 is composed of radially extending ribs 13 and an optical fiber housing groove 14 formed between the ribs 13 and the ribs 13. As shown in FIG. 1B, the surface 18 of the optical fiber housing groove 14 is smoothed by heat treatment, by applying a resin or the like, or by another method. The surface 18 of the optical fiber housing groove 14 may be smoothed by the entire surface 18 of the groove 14 or only the surface in contact with the optical fiber 19. The bending stress is applied to the optical fiber 19 housed in the groove 14. So as not to join,
Any method can be used as long as the optical loss of the optical fiber 19 can be prevented. As described above, the slot rod of the present invention includes the inner layer 15 made of the solid layer and the outer layer 16 made of the foam layer. Therefore, the inner layer 15 having a small outer diameter is a solid layer having sufficient mechanical strength but poor flexibility, and the foam layer having a low mechanical strength but excellent flexibility is positioned on the outer side. The thickness of the inner layer 15 composed of the body layer is sufficient to satisfy the mechanical strength, and the outer layer 16 including the optical fiber housing groove 14 can be designed according to the number of optical fiber cores. . In the above, the configuration of the optical fiber housing portion main body 12 has been described by the combination of the inner layer 15 made of a solid body layer and the outer layer 16 made of a foamed layer. It is also possible to configure the entire fiber container main body 12 only with the foam layer. An embodiment of the present invention will be described below. An optical fiber housing body 12 having a thickness shown in Table 1 was provided on the outer periphery of a tension member 11 made of FRP having an outer diameter of 1.4 mm. The outer layer 16 of Examples 1 and 2 and Comparative Example 2 had a foaming ratio of 40.
% Of polyethylene foam, and the inner layers of Example 1 and Comparative Example 1 were molded of solid polyethylene. Examples 1 and 2
The surface of the groove was coated with a silicon resin to a thickness of 400 μm and cured to obtain a smooth surface. The flexibility of such a slot rod was measured. For the measurement, a sample length of 500 mm was horizontally supported in a cantilever manner, a load was applied to the end opposite to the fixed end, and the amount of change was measured. The results are shown in FIG. Next, five optical fibers 19 were inserted into these slot rods to produce an optical fiber cable, and the optical loss of the optical fiber was measured.
The result is shown in FIG. [Table 1] From the graph of FIG. 2, Example 2 and Comparative Example 2 are excellent in flexibility, and Example 1 is slightly inferior in flexibility to Example 2, but considerably flexible compared to Comparative Example 1. Is superior.
As can be seen from the graph of FIG. 3, Examples 1 and 2 and Comparative Example 1
Hardly increases the optical loss. However, the optical loss of Comparative Example 2 is greatly increased to 0.15 dB / km. As described above, the slot rod of the present invention is excellent in flexibility and does not cause light loss. In the above embodiment, the foaming rate of the outer layer is set to 40%, but the foaming rate is preferably 10 to 70% in consideration of mechanical strength, flexibility, and the like, and the bubble diameter is 10 to 400 μm. preferable. Also,
To smooth the groove in contact with the optical fiber core, use UV
It is preferable to increase the smoothness by forming a solid layer having a thickness of 50 to 400 μm using an ultraviolet curable resin such as a resin or a thermosetting resin such as a silicone resin. Further, since the slot rod of the present invention is coated with a resin or the like on the surface of the groove in contact with the optical fiber so as to have a smooth surface, the dimensional accuracy of the groove does not need to be considered when forming the outer layer by foam extrusion. The molding speed can be greatly increased and the productivity is excellent. As described in detail above, according to the present invention,
To provide an optical fiber cable that can provide a slot rod that is excellent in flexibility and does not cause optical loss, can sufficiently cope with an increase in the number of optical fibers, and can contribute to the construction of a communication network using an optical fiber that is increasingly developed. be able to.
【図面の簡単な説明】
【図１】（イ）は本発明の第１の実施例を示す縦断面
図、（ロ）は（イ）の部分拡大図である。
【図２】可撓性測定結果を示すグラフである。
【図３】光損失測定結果を示すグラフである。
【図４】（イ）は従来のスロットロッドを示す縦断面
図、（ロ）は（イ）の部分拡大図である。
【図５】従来のスロットロッドを示す縦断面図である。
【符号の説明】
１０ スロットロッド
１１ テンションメンバー
１２ 光ファイバ収納部本体
１３ リブ部
１４ 光ファイバ収納溝
１５ 内層
１６ 外層
１８ 溝の表面
１９ 光ファイバBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a longitudinal sectional view showing a first embodiment of the present invention, and FIG. 1B is a partially enlarged view of FIG. FIG. 2 is a graph showing flexibility measurement results. FIG. 3 is a graph showing the results of light loss measurement. 4A is a longitudinal sectional view showing a conventional slot rod, and FIG. 4B is a partially enlarged view of FIG. 4A. FIG. 5 is a longitudinal sectional view showing a conventional slot rod. DESCRIPTION OF SYMBOLS 10 Slot rod 11 Tension member 12 Optical fiber housing main body 13 Rib 14 Optical fiber housing groove 15 Inner layer 16 Outer layer 18 Groove surface 19 Optical fiber
───────────────────────────────────────────────────── フロントページの続き (72)発明者 長谷見 明男 東京都千代田区丸の内２丁目６番１号 古河電気工業株式会社内 (72)発明者 上倉 康弘 東京都千代田区丸の内２丁目６番１号 古河電気工業株式会社内 (72)発明者 岩田 秀行 東京都新宿区西新宿三丁目19番２号 日 本電信電話株式会社内 (56)参考文献 特開 昭61−275708（ＪＰ，Ａ) 特開 平10−288725（ＪＰ，Ａ) 特開 平８−234066（ＪＰ，Ａ) 実開 昭60−100711（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 6/44 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akio Hasemi 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Yasuhiro Uekura 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Inside Electric Industries Co., Ltd. (72) Inventor Hideyuki Iwata 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Co., Ltd. (56) References JP-A-61-275708 (JP, A) 10-288725 (JP, A) JP-A-8-234066 (JP, A) Japanese Utility Model Application Showa 60-100711 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) G02B 6/44
Claims (1)
ーの外周に設けた光ファイバ収納部本体とからなり、該
光ファイバ収納部本体は放射線状に伸びるリブ部を有
し、該リブ部とリブ部との間で構成される光ファイバ収
納溝に光ファイバを収納するスロットロッドにおいて、
前記光ファイバ収納部本体は発泡体で構成され、該発泡
体で構成された光ファイバ収納溝の少なくとも光ファイ
バと接触する表面が平滑な充実体層で覆われていること
を特徴とする光ファイバケーブル用スロットロッド。(57) [Claim 1] It comprises a tension member and an optical fiber housing main body provided on the outer periphery of the tension member, and the optical fiber housing main body has a radially extending rib portion. A slot rod for storing an optical fiber in an optical fiber storage groove formed between the rib portion and the rib portion;
The optical fiber housing main body is made of a foam, and at least the optical fiber of the optical fiber housing groove made of the foam is formed.
A slot rod for an optical fiber cable, wherein a surface in contact with a bar is covered with a smooth solid body layer.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11489098A JP3398046B2 (en) | 1998-04-24 | 1998-04-24 | Slot rod for optical fiber cable |
| EP99917101A EP1024385A4 (en) | 1998-04-24 | 1999-04-22 | Slotted rod for optical fiber cable and optical fiber cable using the slotted rod |
| KR1019997011985A KR20010013959A (en) | 1998-04-24 | 1999-04-22 | Slotted rod for optical fiber cable and optical fiber cable using the slotted rod |
| CN99800318A CN1129803C (en) | 1998-04-24 | 1999-04-22 | Slotted rod for optical fibre and optical fibre using slotted rod |
| PCT/JP1999/002142 WO1999056164A1 (en) | 1998-04-24 | 1999-04-22 | Slotted rod for optical fiber cable and optical fiber cable using the slotted rod |
| TW088106511A TW416019B (en) | 1998-04-24 | 1999-04-23 | Slotted rod for optical fiber cable and optical fiber cable using the slotted rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11489098A JP3398046B2 (en) | 1998-04-24 | 1998-04-24 | Slot rod for optical fiber cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11305085A JPH11305085A (en) | 1999-11-05 |
| JP3398046B2 true JP3398046B2 (en) | 2003-04-21 |
Family
ID=14649222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11489098A Expired - Lifetime JP3398046B2 (en) | 1998-04-24 | 1998-04-24 | Slot rod for optical fiber cable |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1024385A4 (en) |
| JP (1) | JP3398046B2 (en) |
| KR (1) | KR20010013959A (en) |
| CN (1) | CN1129803C (en) |
| TW (1) | TW416019B (en) |
| WO (1) | WO1999056164A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002250836A (en) | 2001-02-23 | 2002-09-06 | Sumitomo Electric Ind Ltd | Fusion splicing method for optical fiber |
| KR20030083859A (en) * | 2002-04-22 | 2003-11-01 | 삼성전자주식회사 | Optical fiber cable with central strength member |
| US7177507B2 (en) * | 2002-12-19 | 2007-02-13 | Corning Cable Systems, Llc | Optical tube assembly having a dry insert and methods of making the same |
| CA2770281C (en) | 2009-08-06 | 2018-02-13 | 3M Innovative Properties Company | System and method for providing final drop in a living unit in a building |
| TWI476469B (en) * | 2009-12-02 | 2015-03-11 | Fujikura Ltd | Fiber optic cable |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60100711U (en) * | 1983-12-14 | 1985-07-09 | 日立電線株式会社 | Spacer type optical fiber cable |
| JPS61275708A (en) * | 1985-05-30 | 1986-12-05 | Sumitomo Electric Ind Ltd | Spacer for optical cable |
| DE4206652A1 (en) * | 1992-03-03 | 1993-09-09 | Siemens Ag | OPTICAL CABLE AND METHOD FOR THE PRODUCTION THEREOF |
| JP3373692B2 (en) * | 1995-02-24 | 2003-02-04 | 住友電気工業株式会社 | Cable spacer |
| JP3349418B2 (en) * | 1997-02-14 | 2002-11-25 | 古河電気工業株式会社 | Fiber optic cable spacer |
-
1998
- 1998-04-24 JP JP11489098A patent/JP3398046B2/en not_active Expired - Lifetime
-
1999
- 1999-04-22 EP EP99917101A patent/EP1024385A4/en not_active Ceased
- 1999-04-22 CN CN99800318A patent/CN1129803C/en not_active Expired - Fee Related
- 1999-04-22 KR KR1019997011985A patent/KR20010013959A/en not_active Application Discontinuation
- 1999-04-22 WO PCT/JP1999/002142 patent/WO1999056164A1/en not_active Application Discontinuation
- 1999-04-23 TW TW088106511A patent/TW416019B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CN1258356A (en) | 2000-06-28 |
| TW416019B (en) | 2000-12-21 |
| WO1999056164A1 (en) | 1999-11-04 |
| EP1024385A1 (en) | 2000-08-02 |
| KR20010013959A (en) | 2001-02-26 |
| JPH11305085A (en) | 1999-11-05 |
| EP1024385A4 (en) | 2001-05-30 |
| CN1129803C (en) | 2003-12-03 |
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